Squaring device with cooling means

Abstract

A squarer includes an electrical heater maintained in thermal contact with a first working surface of a main cooling means, the first working surface also being maintained in thermal contact with a first sensitive element of a first differential temperature sensor. A second sensitive element of the sensor is maintained in thermal contact with a second working surface of the main cooling means, which is in thermal contact with a first working surface of an additional cooling means. A second working surface of the additional cooling means is in thermal contact with a heatsink. The squarer also comprises an additional differential temperature sensor, which has its first sensitive element maintained in thermal contact with the second working surface of the additional cooling means and has its second sensitive element maintained in thermal contact with a respective working surface of the main cooling means.

We claim: 
     
       1. A squaring device comprising an electrical heater with leads serving as inputs of said squaring device; a first cooling means having first and second working surfaces, said first working surface of said first cooling means being maintained in thermal contact with said heater, and said first cooling means having leads serving as a first output of said squaring device; a second cooling means having first and second working surfaces, said first working surface of said second cooling means being maintained in thermal contact with said second working surface of said first cooling means, and said second cooling means having leads serving as a second output of said squaring device; a first temperature sensor having its first and second sensitive elements maintained in thermal contact with said first and second working surfaces of said first cooling means, respectively; a second temperature sensor having its first and second sensitive elements maintained in thermal contact with said second working surface of said second cooling means and one of said working surfaces of said first cooling means, respectively; and, a heatsink maintained in thermal contact with said second working surface of said second cooling means. 
     
     
       2. A squaring device as claimed in claim 1, further comprising a first D.C. amplifier having an input connected to the sensitive elements of the first temperature sensor and an output coupled to the leads of the second cooling means; and, a second D.C. amplifier having an input connected to the sensitive elements of the second temperature sensor and an output connected to the leads of the first cooling means. 
     
     
       3. A squaring device as claimed in claim 1, further comprising a first converter to convert to voltage to pulse length and having an input connected to the sensitive elements of the first temperature sensor and an output coupled to the leads of the second cooling means; and, a second converter to convert voltage to pulse length and having an input connected to the sensitive elements of the second temperature sensor and an output connected to the leads of the first cooling means. 
     
     
       4. A squaring device as claimed in claim 1, wherein said first and second temperature sensors each comprise differential sensors.